[ https://issues.apache.org/jira/browse/PARQUET-460?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Julien Le Dem resolved PARQUET-460. ----------------------------------- Resolution: Fixed Fix Version/s: 1.9.0 Issue resolved by pull request 327 [https://github.com/apache/parquet-mr/pull/327] > Parquet files concat tool > ------------------------- > > Key: PARQUET-460 > URL: https://issues.apache.org/jira/browse/PARQUET-460 > Project: Parquet > Issue Type: Improvement > Components: parquet-mr > Affects Versions: 1.7.0, 1.8.0 > Reporter: flykobe cheng > Assignee: flykobe cheng > Fix For: 1.9.0 > > > Currently the parquet file generation is time consuming, most of time used > for serialize and compress. It cost about 10mins to generate a 100MB~ parquet > file in our scenario. We want to improve write performance without generate > too many small files, which will impact read performance. > We propose to: > 1. generate several small parquet files concurrently > 2. merge small files to one file: concat the parquet blocks in binary > (without SerDe), merge footers and modify the path and offset metadata. > We create ParquetFilesConcat class to finish step 2. It can be invoked by > parquet.tools.command.ConcatCommand. If this function approved by parquet > community, we will integrate it in spark. > It will impact compression and introduced more dictionary pages, but it can > be improved by adjusting the concurrency of step 1. -- This message was sent by Atlassian JIRA (v6.3.4#6332)